微型计算机原理与接口技术第三版课后答案第四章

1、读书破万卷下笔如有神习题、选择CBCAAD三、判断JJJJJ五、设计1、编程实现求S=(X2+Y2)/Z的值，将最后结果放入RESULT单元保存。参考程序如下：DATASEGMENT:定义数据段XDB5：给X、Y、Z赋初值YDB7ZDB2RESLTLTDB9:定义RESULT单元，预留空间DATAENDS:数据段结束CODESEGMENT;定义代码段ASSSUMECS：CODE,DS：DATASTART：MOVAX,DATA:初始化DSMOVDS,AXMOVAL,X:将数据X送ALNIULX;计算X2MOVBX,AX:将中间结果保存到BXMOVAL,Y:将数据Y送ALNIULY:计算Y2ADD

2、AX,BX:X2+Y2,结果保存到AXDIVZ:计算(X2+Y2)/ZMOVRESULT,AL;最后结果送RESULT单元MOVAH,4CH:返回DOSETT21HCODEENDS;代码段结束ENDSTART:汇编结束2 .计算S=(A+B)/2-2(AANDB)oDATASEGMENTADB12BDB51SDB?DATAENDSCODESEGMENTASSUMECS：CODE.DS：DATASTART：MOVAX.DATAMOVDS,AXMOVAL,AADDAL,B,ALSHR读书破万卷下笔如有神MOVAH.AMOVBL,BANDAH,BLMOVBL,AHSHLBL,1SUBAL,BLMOV

3、S,ALMOVAH,4CHINT21HCODEENDSENDSTART3 .参考P86例4.34.DATASEGMENTXDW34SDW?DATAENDSCODESEGMENTASSUMECS：CODE,DS：DATASTART：MOVAX,DATAMOVDS,AXMOVAX,XCMPAX,0JLDOUBCMPAX,10JLETRIBSALAX,1SALAX,1JNIPEXITDOUB：SAL,AX,1JNIPEXITTRIB：SALAX,1ADDAX,XEXIT：MOVS,AXMOVAH,4CHNT21HCODEENDSENDSTART5.统计非数字字符的个数DATASEGMENTBUFDB

4、20HDUP(?)CNTDB?ENDSTADA.读书破万卷下笔如有神CODESEGMENTASSUMECS：CODE,DS：DATASTART：MOVAX,DATAMOVDS,AXLEASLBUFMOVDL,0NEXT1：MOVAH,01HINT21HMOVSI,ALINCSICMPAL,ODHJZEXITCMPAL,30HJGENEXTINCDLJNIPNEXT1NEXT：CMPAL,39HJBENEXT1INCDLJMPNEXT1EXIT：MOVCNT,DLMOVAH,4CHINT21HCODEENDSENDSTART6、将键盘连续输入的小写字母转换成大写字母CODESEGMENTASSU

5、MECS:CODESTART:MOVAH.OIHNT21HMOVBL.ALMOVDLJ-'MOVAH,02HNT21HMOVAL.BLCMPAL,才JBEXITCMPAL,2JAEXITSUBAL,20HMOVDLALMOVAH,02HNT21HDL.OAHMOV读书破万卷下笔如有神MOVAH,02HINT21HMOVDL,0DHMOVAH,02HNT21HJNIPSTARTEXIT:MOVAH.4CHNT21HCODEENDSENDSTART7.统计负数的个数DATASEGMENTBUFDB45,50,-34,40,4,15,29,-1,-2,-59CNEQUS-bufADB?BDB?DATAENDSCODESEGMENTASSUMECS：CODE,DS：DATASTART：MOVAX,DATAMOVDS,AXLEASI.BUFMOVCX,CNMOVBX.OLP:MOVAL,SIINCSITESTAL,SOHJZNEXTINCBHJMPEXITNEXT:INCBLEXIT:LOOPLPMOVA,BLMOVB.BHMOVAH,4CHINT21HCODEENDSENDSTART8、宏定义，将1